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Q: 

How to unit test GUI elements?

I would like to create a custom user control, which extends the textbox in WPF, but only accepts numeric values. When the user types in a non numerical value, the textbox should not respond to the input.

How can I simulate userinput to a textbox, to be able to create a unit test for this behaviour?

I am using the built in test framework in VS2010.

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